hello !!
I m using computed field to Add the two times in a content type in my project .When i m Entering the content in the content type . After saving the node it returns error
"EntityMalformedException: Missing bundle property on entity of type node. in entity_extract_ids() (line 7562 of /var/www/dev/mtbhimalaya/includes/common.inc)." please help me.
The Computed Code is

$node = menu_get_object();
$start_time = field_get_items('node', $node, 'field_start_time_race');
$stop_time = field_get_items('node', $node, 'field_stop_time_race');
$penalties = field_get_items('node', $node, 'field_penalities_grace');
$start_time = $start_time[0]['value'];
$stop_time = $stop_time[0]['value'];
$penalties = $penalties[0]['value'];
$entity_field[0]['value'] = $stop_time - $start_time + $penalties;

$display_output = $entity_field_item['value'];